Arrabidaea monophylla A.H.Gentry
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Authority
Maguire, Bassett. 1978. The botany of the Guayana Highland--part X. Mem. New York Bot. Gard. 29: 1-288.
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Family
Bignoniaceae
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Scientific Name
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Description
Latin Diagnosis - Frutex scandens vel erectus; ramuli teretes, pseudostipuhs minuds, consociebus glandularum in nodis inter pedoles; folia simphcia, ovata, coriacea. lepidota. Inflorescentia contracta subracemosa; calyx cupulatus, 5-denticulatus, leviter lepidotus, margine ciliato; coroha magentea, tubulo-campanulata; stamina didynama, thecis divaricatis; ovarium lineare, lepidotum; discus pulvinatus; capsula linearis, in sicco denigrata; semina bialata, omnino brunneola.
Species Description - Vine, shrub or small tree, branchlets terete, glabrous; pseudostipules bluntconical, inconspicuous, interpedolar glandular fields usually present but inconspicuous. Leaves simple, ovate, acute, truncate to subcordate, coriaceous, 5-8 cm long, 2.5-4 cm wide, lepidote, otherwise glabrous except for a few minute trichomes at base of midvein above, drying blackish, especiahy above; petiole 0.4-0.6 cm long, black, minutely puberulous adaxially. Inflorescence contracted, subracemose, the lateral branches when present short and few-flowered, puberulous, drying blackish, with acute linear bracts subtending each dichotomy. Flowers with the calyx cupular, truncate, 5-denticulate, 3-4 mm long, 2-3 mm wide, scattered lepidote, otherwise almost glabrous, the margin ciliate, with conspicuous plate-shaped glands in upper half, drying blackish; corolla magenta ("rosea"), 2.4-2.8 cm long, 7-8 mm wide at mouth of tube, the tube 1.6-2 cm long, the lobes 0.7-0.8 cm long, puberulous outside and on lobes inside, tube mostly glabrous inside, villous at and below level of stamen insertion; stamens didynamous, inserted ca 7 mm above base of coroha tube, longer filaments 1.3-1.4 cm long, shorter filaments 0.9-1.0 cm long, the anther thecae divaricate, 1.5-2 mm long, the connective somewhat extended, the staminode 3 mm long; pistil 20-21 cm long, ovary linear, 1.5 mm long, 0.5 mm wide, densely minutely lepidote; disc pulvinate, 0.4 mm long, 1 mm wide. Capsule linear, compressed 5-11 cm long, 0.8-1 cm wide, tapered at both ends, scattered lepidote, drying black, the midrib not evident; seeds thin, flat, bialate, 0.5-0.7 cm long, 0.8-1.4 cm wide, the wings narrow, brown, coriaceous, not demarcated from body of seed.
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Discussion
Type. BRAZIL. Roraima: Rio Anaua, afluente do Rio Branco, caatinga com Barcella; cipo; flores roseas; 30 Apr 1974, J. Murça-Pires, P. Cavalcante, H. Magnago & N. T. Silva 14491 (holotype IAN, isotype MO). This species is very disdnct in its lepidote calyx with glands, contracted blackdrying inflorescence, simple, pinnately veined, black-drying leaves, smah fruit without a prominent midrib, and smah seeds lacking hyaline-membranaceous wings. The inflorescence and flower are somewhat reminiscent of A. nigrescens but that species has totahy different 3-foliolate, dendroid pubescent leaves. Other simple-leaved species of Arrabidaea have the leaves pubescent or 3-veined or both. Arrabidaea pliciflora (Mart, ex DC.) Bur. & K. Schum. of Piauhy, Brazil may be its closest relative but differs in oblong leaves with the nerves puberulous below, narrow, elongate panicle, subtomentose calyx, and larger plicate corolla.
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Distribution
Distribution. BRAZIL. Roraima: Rio Anaua, afluented do Rio Branco, cadnga com Barcella; arvore de 20-30 cm, 30 Apr 1974, Pires et al 14495 (MO, IAN); Rodovia BR-174 a 60 km de Caracarai para Rio Anaua (leste-sudeste) 29 Jun 1974, Pires & Leite 14775 (MO, IAN).
Brazil South America|